Well I've had my iPad, 64GB 3G version, for over 10 days now so I thought I would post my impressions so far.
Like a few on here I'm a bit surprised at how much I've been using it, so much so that my laptop has became redundant; except for downloading podcasts and syncing them. It's so handy to just pick it up and browse the web. I was worried about the screen for the first few days and being spoiled with my iPhone 4 but after seeing a few HD episodes of Heroes on it, I'm delighted with quality, it looks fantastic. Even YouTube looks really good(on Wifi). I hate believeing the hype that some reviewers gave it but it really is excellent as a consuming device, be it the web or video.
I wasn't sure about a case as I wanted to keep it in it's dock so I ended up getting the iSee Contour one straight from Apple, should have it in the next day or two.